<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=Edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css" type="text/css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" type="text/css">
    <link rel="stylesheet" href="./resources/prism/prism.css" type="text/css">
    <link rel="stylesheet" href="../css/ol.css" type="text/css">
    <link rel="stylesheet" href="./resources/layout.css" type="text/css">
    
    <link rel="stylesheet" href="box-selection.css">
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="./resources/zeroclipboard/ZeroClipboard.min.js"></script>
    <title>Box Selection</title>
  </head>
  <body>

    <header class="navbar" role="navigation">
      <div class="container">
        <div class="display-table pull-left" id="navbar-logo-container">
          <a class="navbar-brand" href="./"><img src="./resources/logo-70x70.png">&nbsp;OpenLayers Examples</a>
        </div>
        <!-- menu items that get hidden below 768px width -->
        <nav class='collapse navbar-collapse navbar-responsive-collapse'>
          <ul class="nav navbar-nav pull-right">
            <li><a href="../doc">Docs</a></li>
            <li><a class="active" href="index.html">Examples</a></li>
            <li><a href="../apidoc">API</a></li>
            <li><a href="https://github.com/openlayers/openlayers">Code</a></li>
          </ul>
        </nav>
      </div>
    </header>

    <div class="container-fluid">

      <div id="latest-check" class="alert alert-warning alert-dismissible" role="alert" style="display:none">
        <button id="latest-dismiss" type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        This example uses OpenLayers v<span>4.4.2</span>. The <a id="latest-link" href="#" class="alert-link">latest</a> is v<span id="latest-version"></span>.
      </div>

      <div class="row-fluid">
        <div class="span12">
          <h4 id="title">Box Selection</h4>
          <div id="map" class="map"></div>
<div id="info">No countries selected</div>

        </div>
      </div>

      <div class="row-fluid">
        <div class="span12">
          <p id="shortdesc">Using a DragBox interaction to select features.</p>
          <div id="docs"><p>This example shows how to use a <code>DragBox</code> interaction to select features. Selected features are added to the feature overlay of a select interaction (<code>ol.interaction.Select</code>) for highlighting.</p> <p>Use <code>Ctrl+Drag</code> (<code>Command+Drag</code> on Mac) to draw boxes.</p>
</div>
          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.events.condition.html" title="API documentation for ol.events.condition">ol.events.condition</a></li>,<li><a href="../apidoc/ol.format.GeoJSON.html" title="API documentation for ol.format.GeoJSON">ol.format.GeoJSON</a></li>,<li><a href="../apidoc/ol.interaction.DragBox.html" title="API documentation for ol.interaction.DragBox">ol.interaction.DragBox</a></li>,<li><a href="../apidoc/ol.interaction.Select.html" title="API documentation for ol.interaction.Select">ol.interaction.Select</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li></ul></div>
        </div>
      </div>

      <div class="row-fluid">
        <div id="source-controls">
          <a id="copy-button"><i class="fa fa-clipboard"></i> Copy</a>
          <a id="codepen-button"><i class="fa fa-codepen"></i> Edit</a>
        </div>
        <form method="POST" id="codepen-form" target="_blank" action="https://codepen.io/pen/define/">
          <textarea class="hidden" name="title">Box Selection</textarea>
          <textarea class="hidden" name="description">Using a DragBox interaction to select features.</textarea>
          <textarea class="hidden" name="js">var vectorSource &#x3D; new ol.source.Vector({
  url: &#x27;https://openlayers.org/en/v4.4.2/examples/data/geojson/countries.geojson&#x27;,
  format: new ol.format.GeoJSON()
});


var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    }),
    new ol.layer.Vector({
      source: vectorSource
    })
  ],
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});

// a normal select interaction to handle click
var select &#x3D; new ol.interaction.Select();
map.addInteraction(select);

var selectedFeatures &#x3D; select.getFeatures();

// a DragBox interaction used to select features by drawing boxes
var dragBox &#x3D; new ol.interaction.DragBox({
  condition: ol.events.condition.platformModifierKeyOnly
});

map.addInteraction(dragBox);

dragBox.on(&#x27;boxend&#x27;, function() {
  // features that intersect the box are added to the collection of
  // selected features
  var extent &#x3D; dragBox.getGeometry().getExtent();
  vectorSource.forEachFeatureIntersectingExtent(extent, function(feature) {
    selectedFeatures.push(feature);
  });
});

// clear selection when drawing a new box and when clicking on the map
dragBox.on(&#x27;boxstart&#x27;, function() {
  selectedFeatures.clear();
});

var infoBox &#x3D; document.getElementById(&#x27;info&#x27;);

selectedFeatures.on([&#x27;add&#x27;, &#x27;remove&#x27;], function() {
  var names &#x3D; selectedFeatures.getArray().map(function(feature) {
    return feature.get(&#x27;name&#x27;);
  });
  if (names.length &gt; 0) {
    infoBox.innerHTML &#x3D; names.join(&#x27;, &#x27;);
  } else {
    infoBox.innerHTML &#x3D; &#x27;No countries selected&#x27;;
  }
});
</textarea>
          <textarea class="hidden" name="css">.ol-dragbox {
  background-color: rgba(255,255,255,0.4);
  border-color: rgba(100,150,0,1);
}
</textarea>
          <textarea class="hidden" name="html">&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;div id&#x3D;&quot;info&quot;&gt;No countries selected&lt;/div&gt;
</textarea>
          <input type="hidden" name="resources" value="https://openlayers.org/en/v4.4.2/css/ol.css,https://openlayers.org/en/v4.4.2/build/ol.js">
          <input type="hidden" name="data">
        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Box Selection&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.4.2/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.4.2/build/ol.js"&gt;&lt;/script&gt;
    &lt;style&gt;
      .ol-dragbox {
        background-color: rgba(255,255,255,0.4);
        border-color: rgba(100,150,0,1);
      }
    &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;div id&#x3D;&quot;info&quot;&gt;No countries selected&lt;/div&gt;
    &lt;script&gt;
      var vectorSource &#x3D; new ol.source.Vector({
        url: &#x27;https://openlayers.org/en/v4.4.2/examples/data/geojson/countries.geojson&#x27;,
        format: new ol.format.GeoJSON()
      });


      var map &#x3D; new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          }),
          new ol.layer.Vector({
            source: vectorSource
          })
        ],
        target: &#x27;map&#x27;,
        view: new ol.View({
          center: [0, 0],
          zoom: 2
        })
      });

      // a normal select interaction to handle click
      var select &#x3D; new ol.interaction.Select();
      map.addInteraction(select);

      var selectedFeatures &#x3D; select.getFeatures();

      // a DragBox interaction used to select features by drawing boxes
      var dragBox &#x3D; new ol.interaction.DragBox({
        condition: ol.events.condition.platformModifierKeyOnly
      });

      map.addInteraction(dragBox);

      dragBox.on(&#x27;boxend&#x27;, function() {
        // features that intersect the box are added to the collection of
        // selected features
        var extent &#x3D; dragBox.getGeometry().getExtent();
        vectorSource.forEachFeatureIntersectingExtent(extent, function(feature) {
          selectedFeatures.push(feature);
        });
      });

      // clear selection when drawing a new box and when clicking on the map
      dragBox.on(&#x27;boxstart&#x27;, function() {
        selectedFeatures.clear();
      });

      var infoBox &#x3D; document.getElementById(&#x27;info&#x27;);

      selectedFeatures.on([&#x27;add&#x27;, &#x27;remove&#x27;], function() {
        var names &#x3D; selectedFeatures.getArray().map(function(feature) {
          return feature.get(&#x27;name&#x27;);
        });
        if (names.length &gt; 0) {
          infoBox.innerHTML &#x3D; names.join(&#x27;, &#x27;);
        } else {
          infoBox.innerHTML &#x3D; &#x27;No countries selected&#x27;;
        }
      });
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
      </div>
    </div>

    <script src="./resources/common.js"></script>
    <script src="./resources/prism/prism.min.js"></script>
    <script src="loader.js?id=box-selection"></script>
  </body>
  <script>
  var packageUrl = 'https://raw.githubusercontent.com/openlayers/openlayers.github.io/build/package.json';
  fetch(packageUrl).then(function(response) {
    return response.json();
  }).then(function(json) {
    var latestVersion = json.version;
    document.getElementById('latest-version').innerHTML = latestVersion;
    var url = window.location.href;
    var branchSearch = url.match(/\/([^\/]*)\/examples\//);
    var cookieText = 'dismissed=-' + latestVersion + '-';
    var dismissed = document.cookie.indexOf(cookieText) != -1;
    if (!dismissed && /^v[0-9\.]*$/.test(branchSearch[1]) && '4.4.2' != latestVersion) {
      var link = url.replace(branchSearch[0], '/latest/examples/');
      fetch(link, {method: 'head'}).then(function(response) {
        var a = document.getElementById('latest-link');
        a.href = response.status == 200 ? link : '../../latest/examples/';
      });
      var latestCheck = document.getElementById('latest-check');
      latestCheck.style.display = '';
      document.getElementById('latest-dismiss').onclick = function() {
        latestCheck.style.display = 'none';
        document.cookie = cookieText;
      }
    }
  });
  </script>
</html>
